81 lines
1.4 KiB
Plaintext
81 lines
1.4 KiB
Plaintext
%{
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#include <stdlib.h>
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typedef enum {cGLOBAL, cLOCAL} class;
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typedef enum {tREAL, tINTEGER} type;
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typedef char * name;
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struct symbol { class c; type t; name id; };
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typedef struct symbol symbol;
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struct namelist { symbol *s; struct namelist *next; };
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typedef struct namelist namelist;
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extern symbol *mksymbol(type t, class c, name id);
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#ifdef YYBISON
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#define YYLEX_DECL() yylex(void)
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#define YYERROR_DECL() yyerror(const char *s)
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#endif
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%}
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%token <cval> GLOBAL LOCAL
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%token <tval> REAL INTEGER
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%token <id> NAME
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%type <nlist> declaration(<id>) namelist(<cval>, <tval>) locnamelist(<tval>)
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%type <cval> class
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%type <tval> type
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%destructor {
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namelist *p = $$;
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while (p != NULL)
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{ namelist *pp = p;
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p = p->next;
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free(pp->s); free(pp);
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}
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} <nlist>
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%union
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{
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class cval;
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type tval;
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namelist * nlist;
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name id;
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}
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%start declaration
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%%
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declaration($d): class type namelist($1, $2)
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{ $$ = $3; }
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| type locnamelist($1)
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{ $$ = $2; }
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;
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class : GLOBAL { $$ = cGLOBAL; }
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| LOCAL { $$ = cLOCAL; }
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;
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type : REAL { $$ = tREAL; }
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| INTEGER { $$ = tINTEGER; }
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;
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namelist: namelist($c) NAME
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{ $$->s = mksymbol($<tval>t, $<cval>c, $2);
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$$->next = $1;
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}
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| NAME
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{ $$->s = mksymbol($t, $c, $1);
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$$->next = NULL;
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}
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;
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locnamelist($t): namelist(cLOCAL, $t)
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{ $$ = $1; }
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;
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%%
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extern int YYLEX_DECL();
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extern void YYERROR_DECL();
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